Soil washing restoration system based on reduction concentration design concept and method thereof

A soil leaching and remediation system technology is applied in the field of soil leaching and remediation systems based on the design concept of weight reduction and concentration, to achieve the effects of reducing comprehensive restoration costs, achieving reduction, and improving system productivity and restoration efficiency.

Active Publication Date: 2015-04-01
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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Problems solved by technology

So far, there is no successful case of soil leaching engineering application in China, and most of the developed soil leaching technologies and equipment are aimed at laboratory or pilot-scale research.

Method used

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  • Soil washing restoration system based on reduction concentration design concept and method thereof

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Embodiment 1

[0055] Remediation project of a contaminated site of a chemical group in Northeast China. The project site is formed by land reclamation. The lithology of the shallow strata is mainly composed of gravel, backfill muck and some clay, and some parts are cement ground, construction waste, and muddy soil. The main soil pollutants of this site are 3 kinds of heavy metals represented by arsenic and 7 kinds of polycyclic aromatic hydrocarbons represented by benzo(a)pyrene. The amount of contaminated soil to be repaired is 279,000 cubic meters. The soil washing system of the present invention is adopted Make repairs. Under normal load conditions, the soil washing equipment system has an average treatment efficiency of 15 cubic meters per hour. The specific operation process of the system is as follows: figure 1 shown.

[0056] The polluted soil that has been pretreated to remove large rocks (>100mm) is loaded from the feed bin 1, transported by the conveyor belt into the electromag...

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Abstract

The invention discloses a soil washing restoration system based on a reduction concentration design concept and a method thereof. The washing restoration system comprises the following four module units which are sequentially connected with one another: a feeding and screening unit, an ore washing unit, a sludge dewatering unit and a tail-end sewage treatment recycling unit. The pollutants on the surface of coarse particles are eluted, transferred and concentrated into the filter-pressed mud cake by virtue of washing, so that pollutant-containing fine particles in contaminated soil can be effectively separated from crude particles such as gravel and grit. The repaired and discharged clean gravel and grit can be directly recycled to serve as building material. According to the system, purified water serves as a washing solution, so that secondary pollution caused by addition of a chemical washing agent is avoided, and the washing solution is treated by a tail-end sewage treatment system so as to be recycled. The reduction of remediation of contaminated soil is realized, the comprehensive repair cost is greatly reduced, the washed and discharged materials can be recycled, the contaminated soil is repaired, and a novel profit point is created.

Description

technical field [0001] The invention relates to soil remediation technology, in particular to the leaching and remediation of polluted soil with high coarse particle content, and in particular to a soil leaching and remediation system and method based on the design concept of reduction and concentration. Background technique [0002] According to the National Soil Pollution Survey Bulletin jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources, the area of ​​polluted soil in my country is as high as 16%. will become increasingly prominent. In particular, a large number of decommissioned industrial sites are generated during the process of "retreating from the second to the third" and "retreating from the city to enter the park". These sites often occupy valuable positions in the city, and with the advancement of urbanization, they will become commercial sites in the future. However, most decommissioned industrial sites have serious...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08
Inventor 李书鹏杨远强郭丽莉刘渊文王亚晨陈伟伟
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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